Q. Who was the royal Acharya at King Janaka’s court, later defeated by Ashtavakra? Answer:
Brahmarshi Vandin
Notes: Brahmarshi Vandin, son of Varuna, served as royal Acharya in Mithila under King Janaka and was famously defeated by Ashtavakra in debate, as mentioned in Mahabharata, Vana Parva 132.